Iterate over Map

Question

Hi
I have to override toString() to print out everything in my HashMap. It�s like I have a totally black out. Help me please.
This is what I have:
This Map is a graph filled with Cities and each City has an ListArray with Edges (containing info about transport way and weight of edge, in this case, time it takes to transport from one node to another).
This is how my Map looks like in a class called ListGraph<N>
Map<N, List<Edge<N>>> all = new HashMap<N, List<Edge<N>>>();So first I put Cities into my Graph whith addNode method from main-method somewhere:
all.put(city, new ArrayList<Edge<N>>());Then I connect each node (City) with another node.
myGraph.connect("Universe", "Galaxy", "Train", 35);myGraph is a Graph myGraph in main-method
Now I want to print out my graph with toString() method
like
System.out.println(myGraph);How do I iterate over my Map and use toString so it looks like this:
from Universe:  to Galaxy by Train(35)And if Universe has more edges they should also be printed out like
from Universe:  to Galaxy by Train(35), to the Sun(85), to foodcourt(2)Someone?

Answer 1

How do I iterate over my Map and use toString so it
looks like this:
from Universe:  to Galaxy by Train(35)
A usual way to iterate over map is:
     Map<A, B> map = new HashMap<A, B>();
     // map.put(new A("a1"), new B("b1"));
     // map.put(new A("a2"), new B("b2"));     
     for(A key : map.keySet()){   
         B val = map.get(key);
         System.out.println(key + ": " + val);
     }